You should decide if you want to make a serious run at being an option for true production-quality deployment, or if this is a fun project. If it's just a fun project, you may want to consider not worrying about replication/redundancy; it's tricky, quirky, and if you haven't been considering it from day one, likely to require a near-complete rewrite, which may be an awful lot of work for a fun project. Of course, if you are going to be serious, it is a must.

I am completely neutral on which direction you go; my point here is just that if you are just having some fun, you may find replication will turn out to be, well, potentially rather unfun. Educational as can be, though. It's a far, far more subtle problem than initially meets the eye.